I don't usually promote individual stamp dealers, but I'm making an exception in this case for two reasons. First, the items offered are unusual and worth knowing about. Second, and more importantly, the dealer has made his price list available at no cost on his web site, so that everyone can have information about the items.
The dealer is Mike Holt, and he is currently offering three very interesting groups of items:
1. De La Rue and Harrison Trial printings, used to test papers and phosphor bands.
2. Giant Machin Heads, printed in color at A4 size, used for checking the head prior to an actual print run.
3. Uncut booklet cover proofs in columns of four or five.
Visit Mike's site at www.mike-holt.com and look for price list 35. You can download parts of the list as PDF files.